Crusher



D. COLE CRUSHER Jan. 1, 1935.

Filed July 1, 1932 2 Sheets-Sheet 1 Jam 1, 1935.

D. COLE CRUSHER 2 Sheets-Sheet Filed July 1. 9

Patented Jan. 1, 1935 UNITED STATE CRUSHER i David Cole, ElPaso, Tex

' Application July 1,1932,- Serial No. 620,517

, 16 Claims. (011. 83-10 This invention relates to crushers andparticularly to gyratory crushers intended for use in fine crushing, of which the shorthead Symons cone crusher is typical. 1

In developing a cone crusher for fine crushing Work, according to "the well known Symons principles, it was found expedient to lessen the height of the head by elimination of the upper portion, and to devote a'large proportion of its effective crushing area'to the production of fines. The effector this was to reduce greatly the maximum size stone that the crusher will take and to reduce the entrance flare between the head and bowl so that the range of sizes in the feed must be much more closely controlled thanin the prior types of Symons crusher. Thislimitation impairs the availability of the shorthead crusher and of any similarly designed fine :crushing gyratorycrusher for use in further crushing the productfrom" existing and less highly developed preparatory crushing equipment.

The material whichis to be fed to shorthead and like crushers, must be preparedin a coarse crusher. This may or may'not be of the gyratory type. Regardless of type, existing machines may be expected to deliver a small percentage of socalled oversize in the product. Thus, if the fset 15 2, the product will have from 3% to 10% of pieces which will exceed 2", i. e'., irregular shaped pieces which will not enter a 2 gap atthe entrance of 'shorthea'd'cone crushers. In practice these oversize pieces accumulate on the feed table in'the hopper from which the shorthead crusher is fed, and eventually occupy this hopper to the exclusion of other feed. The effect is to put the shorthead crusher out of action.

To set the preceding coarse crusher so close as to ensure that its entire output would enter the 2" gap at the entrance of the shorthead crusher, would be to reduce greatly the capacity'of the coarse crusher, overstrain it, and add very mate! rially to the cost of the preparatory crushing work. 1

The present invention overcomes thedifficulty by modifying the shorthead or fine crushing crusher in such a way as to impart to it a capacity to accept at least a limited amount of oversize feed without materially reducing its capacity and without impairing itseffectiveness. The invention involves the discovery that even the limited flare zone of the present shorthead crushersis more than ample to provide feed to the fine crushing and sizing zone so that it is possible to sacrifice a small percentage of the crushing area in the entrance flare zone and apply this area to the crushingof oversize, In this way the burden of taking care of the oversize is placed on the fine crusher. The effect is to increase the availabilityof the fine crusher with respectto the acceptance of feed of varying sizes without impairrnent or its crushing'iunctions.

The preferred arrangement'is to bowl -liner; the pockets being arranged to catch andv crush the stray rive? with the'feed. Such pocket or pockets may, however be formed in the head mantle instead or being formed in the bowl liner, or they may be-formed both in the head mantle and in the bowl-linen 'Inthe lattercase, if the numbers ofpock'etsiin the head mantle and in the bowl liner a're' incommensurate; a hunting effect can be secured with de'sirable'results. The possibility offorming pockets of the substantial dimensionsnecessary to receive oversize pieces, without materially reducing the effective crushing area of the flaring entrance zone, arises from thefact-that in shorthead and similar crushers the entrance interval between the head and'bowl is'smallascompared to the diameter of the head at the entrance. Thus a pocket large enough-" td receive a piece whose diameter is say 1.5'thenorma-l size will occupy only a small fraction of the entrance periphery of the head or bowl as the case maybe.

" Iprefer a=iorm of pocket which increases in depth-and inwidth toward the entrance to the flaring entrance zone, and thus provides a limited area in which the entrance flare is increased, but

the invention is not limited in this respect.

' Several embodiments of the inventionare illustratedin theaccompanying drawings, in which,-

Fig; 1 is a vertical axialsection of a Symons 'typ'e of crusher with the invention applied in its preferred 'form.-

liner in their-proper relation to each other, as

eretof ore used in shorthead cone crushers.

Fig; 3 is a similarfview showing a modification 0f the'invention in which the'pockets are formed at the entrance periphery of the head mantle. Fig. i is a similar view showing a modification of the inventio'riin which the pockets are formed at the'entrance periphery of both the head mantle and thebowl liner. L

Fig. 5is a section'on'the line 5%5 showing in commensurate spacings of the pockets in the head mantle and bowlliner serving to cause the pockets to hunt."'

In'thedrawings, 11 represents aportion of the base framein wh'ich turns the sle'eve'12. The gyrating crushinghead 13 iscarried on a tapered spindle 14 which is journaled in the sleeve 12 on an inclined, eccentric axis, as "usual. The usual dustexcluding members are shown at 15, and the bevel drive gearsfor the sleeve-12 appear at 16 and 1'7.

The head 13 carries the usual cone or mantle provide one or more pockets at the entrance periphery of the oversize pieces as they artrance, and a fine crushing zone, at least'one of said head and bowl members having a pocket formed in the entrance zone, said pocket flaring in width and depth from near the junction of the two zones to the entrance to the flaring zone, the width of said pocket at the entrance to the flaring zone exceeding the maximum separation between said head and bowl members at the entrance to said flaring zone.

6. The combination of a crushing head; an encircling bowl; and means for imparting relative gyratory motion thereto, said head and bowl cooperating to form a flaring entrance zone narrow relatively to the diameter of the head at the entrance, and a fine crushing zone, said head and bowl each having a pocket formed in the entrance zone, said pocket flaring in width and depth from near the junction of the two zones to the entrance to the flaring zone, the widths of said pockets at such entrance each exceeding the maximum separation of the head and bowl at such entrance.

7. The combination of a crushing head; an encircling bowl; and means for imparting relative gyratory motion thereto, said head and bowl cooperating to form a flaring entrance zone narrow relatively to the diameter of the head at the entrance, and a fine crushing zone, said bowl having a pocket formed in the entrance zone, said pocket flaring in width and depth from near the junction of the two zones to the entrance to the flaring zone, the width of said pocket at such entrance exceeding the maximum separation of the head and bowl at such entrance.

8. The combination of a crushing head; an encircling bowl; and means for imparting relative gyratory motion thereto, said head and bowl cooperating to form a flaring entrance zone narrow relatively to the diameter of the head at the entrance, and a fine crushing zone, said head having a pocket formed in the entrance zone, said pocket flaring in width and depth from near the junction of the two zones to the entrance to the flaring zone, the width of said pocket at such entrance exceeding the maximum separaton of said head and bowl at such entrance.

9. The combination of a crushing head; an encircling bowl, said head and bowlhaving each two conical portions which coact to form a'flaring entrance zone narrow relatively to the diameter of the head at the entrance, and a zone of parallelism; and meansfor imparting relative gyratory motion to the head and bowl, there being in the entrance zone in one of said head and bowl members at least one tapered pocket having a greater entranceflare than the entrance zone, the width of said pocket at its entrance exceeding the maximum separation between the conical surfaces of the head and bowl at such entrance.

10. The combination of a crushing head; an en-. circling bowl, said head and bowl having each two conical portions which coact to form a flaring entrance zone narrow relatively'to the diameter of the head at the entrance, and a zone of parallelism; and means for imparting relative gyratory motion to the head and bowl, there being in the entrance zone in the head at least one tapered pocket having a entrance zone, the width of said pocket at its entrance exceeding the maximum separation between the conical surfaces of the head and bowl at such entrance.

greater entrance flare than the v 11. The combination of a crushing head; an encircling bowl, said headand bowl having each two conical portions which coact to form a flaring entrance zone narrow relatively to the di-, ameter of the head at the entrance, and a zone of parallelism; and means for imparting relative gyratory motion to the head and bowl, there being in the entrance zone in the bowl at least one tapered pocket having a greater entrance flare than the entrance zone, the width of said pocket at its entrance exceeding the maximum separation between the conical surfaces of the head and bowl at such entrance.

12. The combination of a crushing head; an encircling bowl, said head and bowl having each two conical portions which coact to form a flaring entrance zone narrow relatively to the diameter of the head at the entrance, and a zone of parallelism; and means for imparting relative gyratory motion to the head and bowl, there being in the entrance zone in the head and in the bowl at least one tapered pocket having a greater entrance flare than the entrance zone, the entrance widths of said pockets each exceeding the maximum separation between the conical portions ofsaid head and bowl.

13. The combination of a encircling bowl; and means for imparting relative gyratory motion thereto, said head and bowl cooperating to define a flaring entrance zone and a fine crushing zone, at least one of said head and bowl members having a pocket dimensioned to permit entrance between the head and bowl of a piece of the order of 50% oversize, said pocket occupying 5% or less of the total crushing area.

crushing head; an

14. The combination of a crushing head; an'

encircling bowl; and means for imparting relative gyratory motion thereto, said head and bowl cooperating to define a flaring entrance zone and a fine crushing zone, the bowl member having a pocket dimensioned to permit the entrance between the head and bowl of a piece of the order of 50% oversize, said pocket occupying 5% or less of the crushing area.

15. The combination of a crushing head; an encircling bowl; and means for imparting relative gyratory motion thereto, said head and bowl cooperating to form a narrow flaring entrance zone and a fine crushing zone to which the flaring entrance zone delivers partially crushed material, said bowl having a pocket at the entrance to the flaring zone, said pocket beingof a width such as not to be bridged by such oversize piece, and! the total pocket area being not to exceed 10% of the total crushing area.

16. The combination of a crushing head; an encircling bowl, said head and bowl having each two conical portions which coact to form a flaring entrance zone narrow relatively to the diameter of the head at the entrance, and a zone of parallelism; and means for imparting relative gyratory motion to the head and bowl, there being in the entrancezone in the head and in the bowl pockets having a greater entrance flare than the entrance zone, the numbers of pockets in the head and bowl being prime the entrance widths of such pockets each exceedto one, another and ing the maximum separation between the conical portions of said head and bowl.

DAVID COLE CERTIFICATE OF CORRECTION.

Patent No. 1,986,104. January 1, 1935.

DAVID COLE.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, second column, line 44, claim 14, before "crushing" insert the word total; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 19th day of February, A. D. 1935.

Leslie Frazer (Seal) Acting Commissioner of Patents. 

